Knowing that you'll never live the life that others do???
Sorry, I have been away from the computer - and must leave again soon. Didn't want to leave you hanging.
Speaking personally, I don't obsess on what other peoples lives are like. They're all different, and for all I know they're all in crisis too. A lot of every day life is a facade - from people putting make-up on to look prettier, to those who will only wear special brands of shoes, or drive BMW's for status..... everyone has a mask of one kind or another.
Instead, you need to put the effort into finding out who you are, and what you want. I saw a documentary recently about a family who sailed around the world on a Yacht. It was a life-long dream. That was THEIR life. I enjoyed the documentary, but I couldn't get away from the fact that I'd not ever want to do what they did - that their lives were completely alien to me.
So I'm not sure who these "others" are you're talking about, but the fact is, we're individuals, not a collective. The world is full of scientists, teachers, cops, garbage men, and strippers. All people - and all different people. You just need to figure out who you are.